This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 12 |
| 2 | 1440 |
| 3 | 362880 |
| 4 | 87091200 |
| 5 | 11496038400 |
| 6 | 376610217984000 |
| 7 | 903864523161600 |
| 8 | 36877672544993280000 |
| 9 | 529710888436283473920000 |
| 10 | 3496091863679470927872000000 |
| 11 | 50785334440817577689088000000 |